Description
TERASAKI ELECTRIC CO.,LTD.
AME3B
3-POLE AIR CIRCUIT BREAKER
IN 128 A
TYPE: XMD4M
UI 690V
FREQ.: 50-60HZ
UIMP: 8KV
CONTROL CIRCUIT: AC100-115V 1.2A
AUX.SWITCH
AC480V 1A DC250V 0.3A
AC250V 5A DC125V 0.6A
1H4921SAA/R
MADE IN JAPAN
The Terasaki AME3B XMD4M is a 3-pole air circuit breaker rated at 128A, designed to provide reliable overcurrent and short-circuit protection within marine electrical distribution systems. As a core component in the Air Circuit Breaker category, it safeguards shipboard power distribution panels, motor control centres, and switchboard assemblies against potentially damaging fault conditions. Operational continuity of onboard electrical systems depends heavily on the integrity of such protective devices, making this a critical element in vessel power management.
Key Features
✓ Rated at 128A nominal current with a UI of 690V and an impulse withstand voltage (Uimp) of 8kV, suitable for high-demand marine power circuits.
✓ Compatible with 50–60Hz supply frequencies and features a control circuit rated at AC100–115V, 1.2A, with auxiliary switch contacts rated AC480V/1A, DC250V/0.3A, AC250V/5A, and DC125V/0.6A.
✓ Designed for integration with marine main switchboards, emergency switchboards, and distribution panels where robust 3-pole circuit protection is required.
✓ Manufactured by Terasaki Electric Co., Ltd. in Japan to established quality standards, supporting dependable performance in demanding marine environments subject to vibration and humidity.
✓ Replacement and installation considerations should be confirmed against vessel-specific switchboard configurations; auxiliary switch wiring and control circuit compatibility should be verified prior to fitment.
Marine Applications
✓ Main and emergency switchboard protection aboard commercial cargo vessels, tankers, and bulk carriers.
✓ Motor control centres managing deck machinery, pumps, and HVAC systems on offshore support vessels and platform supply vessels.
✓ Power distribution panels in engine rooms of passenger ferries, RoRo vessels, and cruise ships requiring reliable fault isolation.
✓ Feeder circuit protection for essential services on naval auxiliaries, research vessels, and dredgers operating on international routes.
✓ Switchgear assemblies in fishing vessels and workboats where compact, high-integrity 3-pole protection is a fundamental requirement.
Why Marine Engineers Choose
Marine engineers specify the Terasaki AME3B XMD4M for its well-established reputation in shipboard electrical protection, its broad voltage range, and the confidence that comes with Japanese manufacturing quality — ensuring consistent performance across long service intervals at sea.
Ideal For
Commercial cargo ships, tankers, bulk carriers, passenger vessels, offshore support vessels, RoRo ferries, fishing vessels, and any seagoing craft requiring robust 3-pole air circuit breaker protection within main or emergency power distribution systems.
Technical Support
Technical support is available for this Terasaki air circuit breaker, covering onboard installation guidance, auxiliary switch configuration, and remote troubleshooting assistance. Specialist advice can be provided to help ensure correct integration within existing switchboard arrangements.
